fsirand.c revision 1.16
1 /* $NetBSD: fsirand.c,v 1.16 2001/10/26 05:56:06 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __RCSID("$NetBSD: fsirand.c,v 1.16 2001/10/26 05:56:06 lukem Exp $"); 42 #endif /* lint */ 43 44 #include <ctype.h> 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include <sys/types.h> 54 #include <sys/param.h> 55 #include <sys/time.h> 56 #include <sys/vnode.h> 57 #include <sys/disklabel.h> 58 #include <sys/ioctl.h> 59 60 #include <ufs/ufs/inode.h> 61 #include <ufs/ufs/ufs_bswap.h> 62 63 #include <ufs/ffs/fs.h> 64 #include <ufs/ffs/ffs_extern.h> 65 66 static void usage(void); 67 static void getsblock(int, const char *, struct disklabel *, struct fs *); 68 static void fixinodes(int, struct fs *, struct disklabel *, int, long); 69 static void statussig(int); 70 71 int main(int, char *[]); 72 73 int needswap, ino, imax; 74 time_t tstart; 75 76 77 static void 78 usage(void) 79 { 80 81 (void) fprintf(stderr, 82 "Usage: %s [-F] [-p] [-x <constant>] <special>\n", 83 getprogname()); 84 exit(1); 85 } 86 87 88 /* 89 * getsblock(): 90 * Return the superblock 91 */ 92 static void 93 getsblock(int fd, const char *name, struct disklabel *lab, struct fs *fs) 94 { 95 struct partition *pp; 96 char p; 97 98 pp = NULL; 99 100 if (lab != NULL) { 101 p = name[strlen(name) - 1]; 102 if (p >= 'a' && p <= 'h') 103 pp = &lab->d_partitions[p - 'a']; 104 else if (isdigit((unsigned char) p)) 105 pp = &lab->d_partitions[0]; 106 else 107 errx(1, "Invalid partition `%c'", p); 108 109 if (pp->p_fstype != FS_BSDFFS) 110 errx(1, "Not an FFS partition"); 111 } 112 113 if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1) 114 err(1, "Cannot seek to superblock"); 115 116 if (read(fd, fs, SBSIZE) != SBSIZE) 117 err(1, "Cannot read superblock"); 118 119 if (fs->fs_magic != FS_MAGIC) { 120 if(fs->fs_magic == bswap32(FS_MAGIC)) { 121 needswap = 1; 122 ffs_sb_swap(fs, fs); 123 } else 124 errx(1, "Bad superblock magic number"); 125 } 126 127 if (fs->fs_ncg < 1) 128 errx(1, "Bad ncg in superblock"); 129 130 if (fs->fs_cpg < 1) 131 errx(1, "Bad cpg in superblock"); 132 133 if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl || 134 (fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl) 135 errx(1, "Bad number of cylinders in superblock"); 136 137 if (fs->fs_sbsize > SBSIZE) 138 errx(1, "Superblock too large"); 139 } 140 141 142 /* 143 * fixinodes(): 144 * Randomize the inode generation numbers 145 */ 146 static void 147 fixinodes(int fd, struct fs *fs, struct disklabel *lab, int pflag, long xorval) 148 { 149 int inopb = INOPB(fs); 150 int size = inopb * DINODE_SIZE; 151 caddr_t buf; 152 struct dinode *dip; 153 int i; 154 155 if ((buf = malloc(size)) == NULL) 156 err(1, "Out of memory"); 157 158 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 159 off_t sp; 160 sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) * 161 (off_t) lab->d_secsize; 162 163 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 164 err(1, "Seeking to inode %d failed", ino); 165 166 if (read(fd, buf, size) != size) 167 err(1, "Reading inodes %d+%d failed", ino, inopb); 168 169 for (i = 0; i < inopb; i++) { 170 dip = (struct dinode *)(buf + (i * DINODE_SIZE)); 171 if (pflag) 172 printf("inode %10d gen 0x%08x\n", ino, 173 ufs_rw32(dip->di_gen, needswap)); 174 else 175 dip->di_gen = ufs_rw32(random() ^ xorval, 176 needswap); 177 if (++ino > imax) 178 errx(1, "Exceeded number of inodes"); 179 } 180 181 if (pflag) 182 continue; 183 184 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 185 err(1, "Seeking to inode %d failed", ino); 186 187 if (write(fd, buf, size) != size) 188 err(1, "Writing inodes %d+%d failed", ino, inopb); 189 } 190 free(buf); 191 } 192 193 /* 194 * statussig(): 195 * display current status 196 */ 197 void 198 statussig(int dummy) 199 { 200 char msgbuf[256]; 201 int len, deltat; 202 time_t tnow, elapsed; 203 204 (void)time(&tnow); 205 elapsed = tnow - tstart; 206 len = snprintf(msgbuf, sizeof(msgbuf), 207 "fsirand: completed inode %d of %d (%3.2f%%)", 208 ino, imax, (ino * 100.0) / imax); 209 if (imax - ino) { 210 deltat = tstart - tnow + (1.0 * (tnow - tstart)) / ino * imax; 211 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, 212 ", finished in %d:%02d\n", deltat / 60, deltat % 60); 213 } else { 214 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, "\n"); 215 } 216 write(STDERR_FILENO, msgbuf, len); 217 } 218 219 int 220 main(int argc, char *argv[]) 221 { 222 char buf[SBSIZE]; 223 struct fs *fs = (struct fs *) buf; 224 struct disklabel lab; 225 struct stat st; 226 int fd, c; 227 long xorval = 0; 228 char *ep; 229 struct timeval tv; 230 int Fflag, pflag; 231 232 Fflag = pflag = 0; 233 234 while ((c = getopt(argc, argv, "Fpx:")) != -1) 235 switch (c) { 236 case 'F': 237 Fflag++; 238 break; 239 case 'p': 240 pflag++; 241 break; 242 case 'x': 243 xorval = strtol(optarg, &ep, 0); 244 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 245 errno == ERANGE) 246 err(1, "Out of range constant"); 247 if (*ep) 248 errx(1, "Bad constant"); 249 break; 250 default: 251 usage(); 252 } 253 254 argv += optind; 255 argc -= optind; 256 257 if (argc != 1) 258 usage(); 259 260 (void) gettimeofday(&tv, NULL); 261 srandom((unsigned) tv.tv_usec); 262 263 if ((fd = open(argv[0], pflag ? O_RDONLY : O_RDWR)) == -1) 264 err(1, "Cannot open `%s'", argv[0]); 265 if (fstat(fd, &st) == -1) 266 err(1, "Cannot stat `%s'", argv[0]); 267 268 if (Fflag) { 269 if (!S_ISREG(st.st_mode)) 270 errx(1, "%s: not a regular file", argv[0]); 271 memset(&lab, 0, sizeof(lab)); 272 lab.d_secsize = DEV_BSIZE; /* XXX */ 273 } else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) { 274 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 275 err(1, "%s: cannot get disklabel information", argv[0]); 276 } else 277 errx(1, "%s: not a block or character device", argv[0]); 278 279 time(&tstart); 280 (void)signal(SIGINFO, statussig); 281 getsblock(fd, argv[0], Fflag ? NULL : &lab, fs); 282 fixinodes(fd, fs, &lab, pflag, xorval); 283 284 (void) close(fd); 285 return 0; 286 } 287
Indexes created Fri Oct 31 11:10:07 GMT 2025